CVE-2023-27351

HIGH KEV RANSOMWARE NUCLEI

Papercut MF < 20.1.7 - Authentication Bypass

Title source: rule

Description

This vulnerability allows remote attackers to bypass authentication on affected installations of PaperCut NG 22.0.5 (Build 63914). Authentication is not required to exploit this vulnerability. The specific flaw exists within the SecurityRequestFilter class. The issue results from improper implementation of the authentication algorithm. An attacker can leverage this vulnerability to bypass authentication on the system. Was ZDI-CAN-19226.

Nuclei Templates (1)

PaperCut NG - Authentication Bypass

HIGHVERIFIEDby daffainfo,jjcho

Shodan: http.html:"PaperCut" || http.html:"papercut" || http.html:"content=\"papercut\"" || cpe:"cpe:2.3:a:papercut:papercut_mf"

FOFA: body="papercut" || body="content=\"papercut\""

References (3)

[Vendor Advisory] https://www.papercut.com/kb/Main/PO-1216-and-PO-1219

[Third Party Advisory, VDB Entry] https://www.zerodayinitiative.com/advisories/ZDI-23-232/

[Third Party Advisory, US Government Resource] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-27351

Scores

CVSS v3 7.5

EPSS 0.8610

EPSS Percentile 99.4%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Details

CISA KEV 2026-04-20

VulnCheck KEV 2023-04-28

ENISA EUVD EUVD-2023-31127

Ransomware Use Confirmed

CWE

CWE-287

Status published

Products (3)

PaperCut/NG 22.0.5 (Build 63914)

papercut/papercut_mf 15.0.0 - 20.1.7

papercut/papercut_ng 15.0.0 - 20.1.7

Published Apr 20, 2023

KEV Added Apr 20, 2026

Tracked Since Feb 18, 2026